Musical Instrument

We used switches to control when the sound is played or not. If the switch is pressed, the lines are connected. Since lines are only connected when the switch is pressed, we made the code play continuous sounds (or what sounds like continuous), this will allow the user to press the switch at anytime and hear the sound, therefore the user controls how long the notes last for. The user is always able to control if the sound will be playing or not. The instrument can play 4 notes (C5, D5, E5, F5), the notes are limited because we had limited material: only 4 switches.
The code we used:

			 /*Khai Tran and Will
			 6/15/2017
			 Musical Instrument
			 */
						
						#define NOTE_C5  523
						#define NOTE_D5  587
						#define NOTE_E5  659
						#define NOTE_F5  698
					
			int noteC = 1; //note C in port 1
			int noteD = 2; //note D in port 2
			int noteE = 3; //note E in port 3
			int noteF = 4; //note F in port 4
			int speakerPin = 13; //speaker connect to pin 13 with a resistor
			 
			void setup() { //code for seting up each button
			  pinMode (noteC, OUTPUT);
			  pinMode (noteD, OUTPUT);
			  pinMode (noteE, OUTPUT);
			  pinMode (noteF, OUTPUT);
			  pinMode (speakerPin, OUTPUT);
			}
			 
			void c () { //code for playing the 'C' note
			  // play the tone using pin 13 with frequency 523 Hz for 500 ms = 0.3 seconds
			  tone(13, 523, 30);
			}
			void d () { //code for playing the 'D' note
			  // play the tone using pin 13 with frequency 587 Hz for 500 ms = 0.3 seconds
			  tone(13, 587, 30);
			}
			void e () { //code for playing the 'E' note
			  // play the tone using pin 13 with frequency 659 Hz for 500 ms = 0.3 seconds
			  tone(13, 659, 30);
			}
			void f () { //code for playing the 'F' note
			  // play the tone using pin 13 with frequency 698 Hz for 500 ms = 0.3 seconds
			  tone(13, 698, 30);
			}
			void loop() {
			  if (digitalRead(noteC)==HIGH) { //play note C(5) if note F is pressed
				c ();
			  }
			  if (digitalRead(noteD)==HIGH) { //play note D(5) if note F is pressed
				d ();
			  }
			  if (digitalRead(noteE)==HIGH) { //play note E(5) if note F is pressed
				e ();
			  }
			  if (digitalRead(noteF)==HIGH) { //play note F(5) if note F is pressed
				f ();
			  
			}
			 
			}